In an earlier contribution to this discussion,
W wrote:

Hi,

What are the pro's and con's of S Plan vs Y Plan heating arrangements?
I am getting a new heating system and I don't know which one to go
for.

TIA, W

A Y-plan uses less components - one motorised valve rather than two (or
more) and probably doesn't need a bi-pass valve. However, the 3-port
mid-position valve plays a strategic role in the overall control of the
boiler and pump, and is not very reliable - causing the whole system to fail
when it goes wrong.

An S-plan is a better technical solution, and gives greater flexibility -
since extra zones can easily be added (called S-plan-plus) if the pipework
layout permits. With a Y-plan, you're stuck with a single heating zone.

--
Cheers,
Set Square
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